[bigiain]

I'm the opposite way. I understand the world in C.

I've got a few references in my head -40C = -40F (because magic), 0C = 32F (water freezing), 37C = just under 99F which I'm mostly approximate to 100F (body temp). 92C ~= 198F (espresso brewing temp), and 100C ~= 212F (boiling).

I use those to interpolate other F temps to whatever precision I need.

Brewing espresso I care about maybe half a degree C precision. Deciding what clothes to wear I only need to be within maybe 5 degrees C (so to me, 60F is "about 20% under halfway between 100F/37C and 32F/0C, so ~20% less than 18.5C - call it 15 = cold enough to take a jacket). For cooking I don't need to care to much about anything better +-20 degrees.